2-3 round burst through my AR, WTF HAPPENED?!?!

byastremski1987

byastremski1987

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I was up at the range the other day doing a bit of shooting. after about 30-40 rounds down range i loaded up another 5 rounds in my mag. i shot 2 off normally but then when i pulled the trigger to fire off the 3rd it fired the round in the chamber and the last 2 rounds in my mag. I instantly pulled my AR apart and checked the bolt to make sure the firing pin wasn't stuck forward. it wasn't, i shook the bolt carrier and everything slid back and forth normally. i pulled the bolt apart and check it all. the firing pin and bolt were clean no crap or anything on it. So i then pulled the trigger assembly out and looked at it no chips dings or marks on it. I clean and lube my rifle after each use.
I figured it was just a totally random moment for my rifle. so i loaded up another mag shot about another 30-40 and it did it again, i only had 2 rounds left this time tho. After that i packed it up and took it home for a very in depth cleaning and inspection. i found nothing out of the ordinary any where on my rifle.

Im lost, why would a clean well maintain rifle do this?

The rifle is less than a year old, it's a Stag Arms Model 2R Govt Edition
roughly 1500 rounds through it 90% being American Eagle 10% being MFS

Any thoughts anyone? things i should double check?
 
Soft primers maybe?

The AR15 has a floating firing pin, so if the primers are soft enough the momentum of the bolt closing CAN sometimes cause the firing pin to set off a round or two, without the trigger components being involved.... But they would have to be pretty soft....

Try cycling your bolt with the trigger pulled back and see if the disconnector is properly catching your hammer? You should hear a 'click' when you release the trigger, if the hammer is riding the bolt home when you release the trigger it shouldn't make any noise.

ETA

To see if its a soft primer, you could take it to the range, put one round in a mag, then use the bolt release to slam the bolt home, do that a few times without pulling the trigger, and see if any of the rounds shoot off?
 
F22_RaptoR said:
Soft primers maybe?

The AR15 has a floating firing pin, so if the primers are soft enough the momentum of the bolt closing CAN sometimes cause the firing pin to set off a round or two, without the trigger components being involved.... But they would have to be pretty soft....

Try cycling your bolt with the trigger pulled back and see if the disconnector is properly catching your hammer? You should hear a 'click' when you release the trigger, if the hammer is riding the bolt home when you release the trigger it shouldn't make any noise.

ETA

To see if its a soft primer, you could take it to the range, put one round in a mag, then use the bolt release to slam the bolt home, do that a few times without pulling the trigger, and see if any of the rounds shoot off?
Click to expand...


I check the disc every time i strip my rifle, after i put it back together at the range i did it a few times. everything seemed normal. The ammo i used is from a case lot i bought several months ago, ive already used about 600 rounds of it thought this rifle with no issues what so ever.

:confused:
 
Ill go grab my rifle and do it about 20 times and see what happens not just 3-4







.....FML! Just did it about 40 times and when i released the trigger the hammer fell forward and hit the pin. This happened twice.

I will email the shop where i got it. Thanks for your help guys
 
byastremski1987 said:
Ill go grab my rifle and do it about 20 times and see what happens not just 3-4







.....FML! Just did it about 40 times and when i released the trigger the hammer fell forward and hit the pin. This happened twice.

I will email the shop where i got it. Thanks for your help guys
Click to expand...


Crappy, but its a good thing ya got it figured out. Sometimes stuff happens and tolerances aren't quite what they should be, but at least now you'll get it fixed :)

ETA

Since you're already messing with it, is there any "slop" with the hammer or trigger on the pins? if the pins weren't quite right they might allow juuust enough movement to allow the disconnector to let go of the hammer too early.
 
Hey check your hammer notch and also check your disconector could be worn, or sometimes a loose primer gets caught under the trigger.
 
Were you very slowly squeezing the trigger and shooting for groups? On a bipod and with the proper (or inproper?) trigger control you can experience bump-fires pretty easily with practise.
 
I'd try loading just 2 rounds in a mag and firmly pull the trigger pointed downrange. If it fires both rounds you have a mechanical issue in the gun.
 
The timing between your trigger sear and disconector is off. You will need to "Re-time" those two parts. Basically what has happened is your trigger sear has worn slightly and your disconector is not engaging the hammer properly any more. It's actually a pretty simple fix, you have to make your disconector grab more of the hammer. Do this by stoning down the front part of the disconector, the flat part that touches the top of the trigger. This will allow it to rotate a little bit more forward and grab more of the hammer disconect sear. Make sense?

Scott
 
m39a2 said:
The timing between your trigger sear and disconector is off. You will need to "Re-time" those two parts. Basically what has happened is your trigger sear has worn slightly and your disconector is not engaging the hammer properly any more. It's actually a pretty simple fix, you have to make your disconector grab more of the hammer. Do this by stoning down the front part of the disconector, the flat part that touches the top of the trigger. This will allow it to rotate a little bit more forward and grab more of the hammer disconect sear. Make sense?

Scott
Click to expand...

X2
check the disconnector or grab an other one that have a better hammer engagement.

FUN 3 rounds Bursts...
 
So i shot off an email last night to the guys at Arms East, They called me right away this morning and went through a few things. They figure it's a sloppy disconnector. They are sending me a new trigger group as im typing this so my problem should be fixed right up quickly.

Thanks to Steve and the guys at Arms East for helping me fix this problem ASAP!

"And here I was thinking this sounded like a feature and not a bug.."
-Sorry dude I put the "WTF HAPPENED" in there to try and make sure i wasn't misleading anyone :p
 
You can also look at the J-spring on your hammer. If it is broken, it can allow the hammer pin to walk slightly thereby allowing for the doubling/tripling.

Boltgun
 
Open the rifle up and see if there is any movement in the hammer in the up or down positions. If there is the hammer could be slipping of the disconnector. Had a similar problem when the hammer pin on a Norinco M4 broke and gave the hammer just enough movement to slip of and fire F/A.
 
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